Roller Cams in Stock Eliminator?

[Bernie Cunningham]

Originally Posted by Bernie Cunningham

Dang, Nascar CUP cars, the big boys, have just recently switched to roller cams and lifters, imagine the beatings that the old flat tappet set up took and yet it stayed together for decades.

Yeah, they also dropped the max RPM as well but before that you had an engine running non stop for hours at WOT at around 9K+ RPM. Very impressive indeed.

I would like to bring this back up as it's got to be relevant.
Does anybody know what the, before roller, spring pressures were on a Nascar CUP car?